Clamp



se if4, 1923. I 1,467,182

A.R.M CANN CLAMP Filed April 20. 1921 Patented Sept. 4, 1923.

UNITED STATES htmtz PATENT FFEE.*

ALFRED R. MCGANN, or HAMILTON, OHIO, assreivon TO THE LIBERTYIMACHINZTEIY 'rOOL'oo, 0E HAMILTON, OHIO, A CORPORATION OF OHIO.

CLAMIP.

Application filed April 20, 1921. Serial No. 462,996.

To all whom, it may concern Be it known that I, ALFRED R. MOCANN, a citizen of the United States, and resident of Hamilton, in the county of Butler and State of Ohio, have invented a certain new and useful Improvement in Clamps, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, forming a part of this specification.

My invention contemplates a clamp adapted to secure a tool block or holder in a plurality of adjusted positions, and relates particularly to that type of clamp wherein the clamp retains the tool block or holder in an adjusted position by frictionally en-- gaging it.

Clamps of the class described are employed to secure adjustably the tool blocks of planers, boring machines and the like. The operator is enabled thereby to adjust the cutting tools relatively to the work. To facilitate this adjustment, it is the practice to pivotally mount the tool blocks upon their respective machines, so that the tool may be adjusted angularly relatively to the path of the work, if the particular machine,

feeds the work to the tool, or the tool may be adjusted angularly relatively to its own path if the machine advances the tool upon the work.

I am aware that clamps have been provided heretofore for securing tool blocks in a plurality of adjusted positions. These clamps are adapted to engage substantially flat surfaces of the tool blocks, the surfaces being disposed in planes parallel to the path through which the blocks may be angularly adjusted.

The objects of my invention are: I

First: to provide a clamp for securing a tool block in a plurality of adjusted posi tions by frictionally engaging a plurality of dissimilar surfaces upon the block.

Second: to provide a clamp for securing a tool block or the like in a plurality of adjusted positions by frictionally engaging a plurality of surfaces of the tool block, the surfaces being disposed angularly relatively to one another.

Third: to provide a clamp for securing a tool block or the like by frictionally engaging a plurality of dissimilar surfaces upon the block, the clamp having means whereby it may be urged against one of the surfaces,

which surface is adapted to draw the clamp Figure 1 is a front elevation of my improved clamp, the clamp being shown in connection with a tool block of the type commonly employed in planers and the like,-

and

Figure 2 is a section on line 2-2 of Figure 1, looking in the direction of the arrows, part of the cross-rail head being shown in elevation.

Similar characters of reference indicate similar parts throughout the several views.

In the drawings, I have illustrated the usual crossrail head of a common type of planer, the cross-rail head comprising a saddlelO, slidably mounted upon the crossrail 11 of theplaner. A tool slide 12 is pivotally mounted in the saddle in the usual manner, and may be secured in a plurality of adjusted positions relative to the saddle byv bolts 13. A tool block 14 is pivotally mounted upon the tool slide 12 by means of a pin 15, which is threaded into the tool slide 12. This structurepermits the tool slide 12 and'tool block 14 to be adjusted about their pivotal axes in planes substantially parallel to each other. The tool block 14: .is provided with a pair. of forwardly extending flanges 1616. Interposed between the flanges 1616 is a tool rest 17, which 'is secured pivotally to the flanges by a pin 18. Bars 1919 are adapted to hold a tool 20 securely against the tool rest 17, a plurality of bolts 21 being provided for that purpose. The details and functions of the above described structure are well known to those skilled in the art, and for this reason no specific description of them will be given in this specification.

I will now describe the novel means which I provide for clamping the tool block 14 in a plurality of adjusted positions, relative to the tool slide 12.

It will be noted that the tool block 14 is provided with an upwardly extending I face of the tongue 22 comprises a surface 24 which is preferably a portion of the conical surface of a cone, also having its axis 00- incident with the axis of the pin 15. As shown in Figure 2, the conical surface 24 is under-cut, relatively to the cylindrical surface 23 for a purpose which will presently appear.

The reference character 25 designates my improved clamp. The clamp is provided with surfaces 26 and 27, which conform respectively to the cylindrical surface 23 and the conical surface 24. Bolts 28-28 project through apertures 2929, provided in the clamp 25, the bolts 2828 being secured to the tool slide 12 by means of integral head portions 3030. The apertures 29-29 have slightly larger diameters than the bolts 28-28, and therefore permit a comparatively small displacement of the clamp transversely of the bolts. A nut 31 is threaded upon the outer end of each of the bolts 2828, the clamp 25 being interposed between the nuts and the tool slide 12. It is apparent that the clamp may be forced against the tool block by tightening the nuts 313l, and that when the surface 27 is forced against the conical surface 24 of the tool block, the clamp 25 will move downwardly until the surface 26 contacts the cylindrical surface 23.

hen the operator desires to reset the tool, the nuts 3131 are loosened and the tool block adjusted to the desired position. The clamp 25 is then urged against the tool block 14. The nuts 31 are tightened until the surfaces 26 and 27 of the clamp bear against the surfaces 23 and 24 of the tool block with sufhcient force to prevent further angular displacement of the tool block relative to the tool slide.

While I have thus described the details of one form of my invention, it is to be understood that I am not limited to these details, except by the scope of the appended claims:

\Vhat I claim is:

l. The combination of a pivotally mount ed tool-block provided with a clamping surface formed as part of a cylinder having its axis co-incident with the pivotal axis of the tool-block and provided with a second clamping surface on its front face, and a clamp provided with clamping surfaces coacting with the respective surfaces of the tool-block.

2. The combination of a support, a toolblock pivoted thereon and having a peripheral surface formed as part of a cylinder having its axis coincident with the pivotal axis of the tool-block and having a surface on its front face inclined inwardly from the peripheral surface toward the support, a clamp provided with clamping surfaces coacting with the respective surfaces of the toolblock, and a device for forcing the clamp against the face of the tool-block, the clamp being movable relatively to said device in a direction transverse of the pivotal axis.

3. The combination with a tool block, of a clamp adapted to secure the tool block in a plurality of adjusted positions by frictionally engaging two surfaces provided upon the tool block, one of the surfaces being so disposed relatively to the other as to cause the clamp to be drawn against the one when the clamp is forced against the other.

4. The combination with a pivotally mounted tool block, of a clamp adapted to secure the tool block in a plurality of adjusted positions by frictionally engaging a plurality of surfaces provided upon the tool block, one of the surfaces being a portion of the cylindrical surface of a cylinder having its axis co-incident with the pivotal axis of the tool block.

5. The combination with a pivotally mounted tool block, of a clamp for securing the tool block in a plurality of adjusted positions by frictionally engaging two surfaces provided upon the block, one of the surfaces being a portion of the surface of a cylinder having its axis co-incident with the pivotal axis of the tool block, and the other surface being undercut relatively to the cylindrical surface.

In witness whereof, I hereunto subscribe my name this first day of April, 1921.

ALFRED R. MOGANN.

lVitnesses ALBERT CUTZWIG, HARRY H. Sorrnsrmz. 

